On Tue, Oct 10, 2017 at 3:31 PM, Dmitri Chebotarov <dcheb...@gmu.edu> wrote:
> Good Morning > > I'm using virtio-scsi (also tried virtio), not using IDE (doesn't IDE have > 4 devices limit? it's long time since I used IDE...). > > This is for servers hosting own/nextCloud and Samba for a small/medium > groups with large datasets (60-80TB) per server. > > If ovirt-scsi allows to attach >20 disks then it meets my needs in this > case. Thank you. > > The reason I opted for LVM is performance. It's so much faster with LVM > and striped volumes compared to a single large disk. I'm seeing very high > 'iowait' numbers (to the point when VM is unresponsive) when I'm dumping > large amount of data to a single disk. But with LVM striped volumes > 'iowait' at around ~20% and I can get to ~750MB/s in the same environment > (same config with single disk is ~160MB/s). > Interesting. What version of Gluster are you using? Are you using sharding? What's the underlying storage for Gluster and how is it set up? > > Also, healing a single large disk on gluster takes ages (I'm using erasure > coded volumes) . > Sharding and newer versions of Gluster should help here. Y. > > > Thank you, > -- > Dmitri Chebotarov. > George Mason University, > 4400 University Drive, > Fairfax, VA, 22030 > GPG Public key# 5E19F14D: [https://goo.gl/SlE8tj] > > > ________________________________________ > From: Yaniv Kaul <yk...@redhat.com> > Sent: Tuesday, October 10, 2017 4:03:08 AM > To: Dmitri Chebotarov > Cc: users@ovirt.org > Subject: Re: [ovirt-users] Maximum storage per VM? > > On Fri, Oct 6, 2017 at 10:24 PM, Dmitri Chebotarov <dcheb...@gmu.edu > <mailto:dcheb...@gmu.edu>> wrote: > Hello > > I'm trying to find any info on how much storage I can attach to a VM. > > Is there a recommended/maximum for number of disks and maximum disk size? > > Disk count depends on the interface - IDE - very few, virtio- 20-something > (depends on the number of PCI slots available), virtio-SCSI - more. > What is the use case? > > > I'm using GlusterFS as backend storage for the cluster. > > The VM uses LVM (/w striped volumes) to manage attached disks. > > Aren't you having layers over layers over layers? Is that the optimal > arrangement? > (Again, would be interesting to understand the use case to better provide > information). > Y. > > > Thank you, > -- > Dmitri Chebotarov. > George Mason University, > 4400 University Drive, > Fairfax, VA, 22030 > GPG Public key# 5E19F14D: [https://goo.gl/SlE8tj] > > _______________________________________________ > Users mailing list > Users@ovirt.org<mailto:Users@ovirt.org> > http://lists.ovirt.org/mailman/listinfo/users > >
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